Padlock.



L; A. E. c; BYRNE.

PADLOGK. #PPLIOATION FILED APR. 19, 1909.

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LAWRENCEA. co'RL'nY 'nvnnngor' .tAHoRE', :I-N'DIA.

' "PADLOGK;

Specification of Letters-Patent.

Patented Oct. 12, 1909.

Application filed April. 19, 1909. 'SeriaIZNo. 490,923.

comprising a casing, a rotatable shacklemounted to project partly fromthe casing, a sl dable-member, which in a predetermined positionholds'the shackle against movement,

and key-operable tumblerlevers controlling the slidable member. 7

The object of the invention is to provide a simple, inexpensive anddurable padlock which is inexpensive to manufacture and easy ofoperation, and which is so c011 structe'd that it is diflicultto force,the lock orto pick the same."

The invention consists in the construetion and combination of parts tobe more fully set forth hereinafter and-particularly set forth in theclaims.

Reference is to be had to the accompanying drawings formmg. apart ofthis specification, 1n whlch similar characters of reference indicatecorresponding parts in all the 1 views, and in which- Figure 1 is afront elevation of an embodif ment of my invention, the front of thecasing being removed :a'ndrthe padlock being shown in the openposition;Fig. 2is a similar view, thelpadlock being shown in the locked. orclosed? position; Fig.13is] a cross section on the line 3+3 of 2.;andFig. let I is a frontelevation of the device showingthe 1 front ofthe casing, the shackle and the tumbler levers removed.

Referring to the drawings a is the shackle whichis circular inconfiguration and at a portion of its circumference is formed with a gapas shown, the interval between the free ends being suflicient to permitof the shackle being passed over objects it is desired to secure. The.endsb, 0, ofthe shackle a are formed with notches cl, e,-adapt e d whenthe shackle is in the closed position to receive and to co-act withextensions f, 9, formed upon a sliding plate it, whereby the shackle ismaintained against movement and the padlock is kept locked. In orderthat the extent of its movement may be limited the shackle a is providedwith a fixed pin or lug 70 adapted to be traveled in a groove Z in theinternal surface of the casing of the padlock.

The sliding plate It is adapted to be moved into and out of engagementwith the free ends 5, c, of the shackle a in a direction longitudinallyof the padlock by means of the engagement therewith of one or more wardsof a key and said plate is provided with slots m, n, with which pins 0,p, rigidly attached'to the padlock casing engage and thus preventtilting or rocking of said sliding plate It relatively to the padlockcasing. Anydesired number of tumbler levers, g may be providedin'accordance with requirements and the keyhole is provided with aninternalscreen-r thereby preventing the insertion for. fraudulentpurposes of any instrument into the padlock.

The tumbler levers have cutaway partsg and 9 connected. .by. partitionshaving p es t ii'ninedpOsitiohs of all the levers are adapted openings.therethrough, which in to register, to permit the movement therevthroughof an arm h of the sliding plate It so thatthe latterhcan be operated bythe keyhused in connection :with the lock. The V tumbler leversare:controlled by a suitable springniembert. The partitions g of the variouslevers have the openingsthere through ;at differentpoints so thatxthetumbler levers :do not bodily register whenthe openings through the.partitions thereof register. It will be understood that the wards ofthekey. are so formed that they properly position. the levers .to causethe openings in the partitions: to register so that theQ-move- :ment ofthe keynot. only adjusts thetumbler levers, but. at the same time movesthe slidlngplate intoor out of'engagement with the shackleLQ. The normalposition of the parts is such that thetwo free ends 6, c, of the shacklea are engagedby correspondingly formed recesses and the extensions 7, g,on the upper end of the slidin g'plateh, which is therefore'in itsuppermostnposition When it is desired to unlock or open the. padlock thekey isinserted and turned so as to lower the sliding plate h fromengagement with the free ends I), c, of the shackle w. The shackle a isthen given a movement so as to bring the two free ends I), 0, thereofout of padlock casing and into a position to permit the space or gap inthe shackle to be passed over whatever object it may be desired tosecure. To close the padlock the shackle a is moved back to its initialposition with its free ends Z), 0, within the padlock casing and the keyis turned so as to cause the sliding plate It to be moved upwardly backinto engagement with said free ends 6, 0. The padlock casing ispreferably formed of a metal casting having a cover plate brazed orotherwise suitably secured thereto. It will thus be seen thatsince theshackle curves inside the lock enormous resistance is ofiered to anypressure applied on account not only of said curvature but also owing tothe body of the lock being cast in one solid piece with the exception ofthe front plate. It would be necessary to break away a large portion ofthe body or casing before the shackle when once in the locked position,could be separated by force from the body of the padlock.

The front plate of the lock is preferably brazed in and is strengthenedwith two lugs or projections which are riveted in position at the topand bottom of the lock respectively through corresponding apertures inthe back plate. If a crow bar or other instrument be inserted in theshackle of a lock constructed as described withthe view of forcing itopen the reslstance would be increased lnasmuch as. the point of thecrow bar would tend to press back the mass of metal on the top of thelock that must of necessity be torn away before the shackle could bereleased from the body. By the provision of a block adapted to slidelongitudinally of the padlock and to engage the shackle a very strongand secure means of fastening is obtained. The number of tumbler leversand the position of each can of course be varied so that no two locksare alike.

, Having now particularly described and ascertained the nature of mysaid invention and in what manner the same is to be performed I declarethatwhat I claim is 1. A padlock, comprising a casing, a rotatablecircular shackle having a gap, and a key operated slidable lockingmember for the shackle, said member having means for entering the gap ofthe shackle and engaging the shackle at each side of the said gap.

2. A padlock, comprising a casing having a curved guideway, a rotatableshackle movably mounted in said guideway and partly projecting from saidcasing, said shackle having a lug, said casing having a guideway withwhich the lug of the shackle engages to limit the movement of saidshackle, a slidable member serving in a predetermined position to holdsaid shackle against rotation, and key-operable tumbler levers controlling said member.

3. A padlock, comprising a casing, a rotatable shackle, a slidablemember servin in a predetermined position to hold sai shackle againstrotation, and key-operable tumbler levers having cutaway parts adaptedto register in predetermined positions of said levers, said slidablemember having a part adapted to cooperate with said levers, whereby insaid predetermined positions of said levers said part is free to movewith said slidable member.

4. A padlock, comprising a casing, a rotatable shackle, a slidablemember serving, in a predetermined position, to hold said shackleagainst rotation, said member having slots, said casing having pins insaid slots and serving to guide said member, and key-operable tumblerlevers having cutaway parts, said slidable member having an armcontrolled by said levers, whereby, in predetermined positions of saidlevers, said arm can move in said cutaway parts.

5. A padlock, comprising a casing, a rotatable shackle, a slidablemember serving in a predetermined position, to hold said shackle againstrotation, means for guiding said member within said casing, key-oaerable tumbler levers, each having a plura ity of cutaway parts havinga partition therebetween, said partitions having openings therethroughadapted to register in predetermined positions of said levers, saidmember having an arm arranged to pass through said openings of saidpartitions when said openings register, whereby said slidable member canmove toward or away from said shackle when said levers are in thepredetermined positions above-mentioned, and a spring controlling saidlevers.

6. A padlock, comprising a casing, a rotatable shackle having a gap, andadjacent to the ends of said gap, notches, and a slidable member havingextensions adapted to engage in said notches and having a part adaptedto engage within said gap in a predetermined position of said slidablemem ber, said slidable member being key-controllable.

In witness whereof I have hereunto set my hand in the presence of twowitnesses.

LAWRENCE A. E. CORLEY BYRNE.

Witnesses RALPH S. DARoY, C. OBRIAN.

